4 8 3 1
6 7 2 9
2 5
6 4 5 8
3 7
9 6 7 2
8 7
4 3 6 1
2 5 1 6
16-12-2010.......medium 16-12-2010
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4 7 5 8 9 3 6 2 1
8 6 1 7 5 2 3 9 4
9 3 2 1 6 4 5 7 8
7 2 6 4 1 5 8 3 9
3 5 4 9 2 8 1 6 7
1 8 9 6 3 7 2 4 5
6 1 8 2 4 9 7 5 3
5 4 7 3 8 6 9 1 2
2 9 3 5 7 1 4 8 6
2=>(1,8) | 6=>(1,7) | 6=>(7,1) | 4=>(5,3) | 3=>(4,8) | 8=>(5,6) | 1=>(5,7) | 9=>(8,7) |

9=>(3,1) | 6=>(3,5) | 1=>(2,3) | 7=>(3,8) | 9=>(4,9) | 1=>(3,4) | 6=>(5,8) | 3=>(6,5) |

1=>(7,2) | 9=>(1,5) | 3=>(3,2) | 9=>(9,2) | 4=>(3,6) | 3=>(9,3) | 5=>(5,2) | 1=>(4,5) |

1=>(6,1) | 9=>(7,6) | 3=>(7,9) | 8=>(9,8) | 7=>(1,2) | 5=>(1,3) | 7=>(4,1) | 8=>(2,1) |

3=>(2,7) | 5=>(2,5) | 2=>(4,2) | 8=>(6,2) | 8=>(3,9) | 2=>(7,4) | 9=>(5,4) | 2=>(5,5) |

8=>(8,5) | 5=>(7,8) | 4=>(9,7) | 7=>(9,5) | 2=>(8,9) | 5=>(8,1) | 4=>(2,9) | 7=>(8,3) |

4=>(7,5) | 5=>(6,9) | 4=>(6,8) |